no. 1 (May 1970)

no. 3 ( 15 June 1970)

no. 4 (July/August 1970)

no. 5 (December 1970)

no. 6 (January 1971)

no. 7 (May 1971)

no. 8 (June 1971)

no. 9 (September 1971)

no. 10 (November 1971)

no. 12 (September 1972)

no. 13 (January 1973)